Cutting tool



July 1, 1930. H. JANSEN 1,169,433

l CUTTING T001.

Filed 001;. 20, 1928 1;; in window frames after the frames are hung matically) a motor 10 is provided having a 60 usara ENT oFFICE HENRY JANSEN, or CHICAGO, ILLINOIS CUTTING TOOL Application led October 20, 1928. Serial No. 313,667.

My invention relates in general to cutting able groove cutter, and illustrating the man? tools and more in particular to a type of ner in which the tool is used; cutting tool known in the trade as a groove Fig. 2 is a front view thereof, and bit. Figs. 3 and 4 are enlarged perspective views 5 Up until a comparatively short time ago all of the two portions of the cutter. power driven wood working tools were of Whereas the main feature of my invention stationary nature, generally so that the cutmay be applied to cutters having a somewhat ting tool is mounted in operable position with different form than that shown I have in respect to a table and the wood to be shaped is actual practice applied my invention to the carried to the table where it is operated upon. general type of groove cutter shown in the 55 Recently, particularly for doing certain kinds drawings and it is to this use that I find the of work, portable power tools have been deinvention particularly adapted. veloped. An example of this is a slotting tool In a portable cutter of this character which is used extensively for cutting slots (which vincidentally I show somewhat schein the building. Considerable difculty has shaft 11 and an end framework 12 to which been had in obtaining a fully satisfactory opa suitable guard casting 13 issecured. This eration of these tools. They are equipped guide comprises a flat plane portion 14 with with small light cutters generally called a middle housing 16 forming a guard for the 2o groove bits and must be run at quite high a cutting tool. An apron guide 17 is also proc5 speed in order for the workmen to use them vided for regulating the position of the cutsatisfactorily. There is a. limit, however, to ter with respect to the work 18 as indicated the speed at which these tools may be run bein Fig. 1. In the tool as actually constructed cause the cutter burns very easily if the speed I provide adjusting means so that the variis too great. ous positions of the guide casting may be 70 It has been suggested in connection with regulated, so that both the depth and sidethese tools that a four bladed cutter be used wise positions of the groove may be coninstead of the present standard two bladed trolled. I have not shown the details of this cutter. But this has been found to be imarrangement in the present case, however, be-

practical for a great many reasons which will cause the invention Adoes not concern itself be apparent from the following disclosure. primarily therewith.

Accordingly the principal object of my in- As to the cutting tool itself which in the vention is the provision of an improved ro- 'Figs 1 and 2 I designate generally by the tary cutting tool. reference character A, this tool is securedon Another object is the provision of a groove the shaft 11 by means of nuts 19-19 and spac- 80 bit having more than the usual number of ers 21-21 are utilized to regulate the position cutting blades. of the cutter along the shaft 11.

Another object is the provision of an im- Substantially all of the structure described proved groove cutter. in the preceding paragraphs is oldin the art,

' Other objects and features of the invention my invent-ion having to do primarily with 85 will be apparent from a consideration of the the cutter per se.. The cutter as I now use it detailed description taken with the accomcomprises two parts 22 and 23 as shown in panying drawings, wherein l Figs. Band 4 respectively. These two parts y Fig. 1 is an elevational view partly in longiare complementary to each other so that when 40 tudinal section showing a portion of a portthey are fitted together the knives will cut in 9U exactly the same line. The two cutters are identical with the exception that one is a left hand cutter and the other a right hand cutter, that is to sa7 they are a pair and when put together, one opposing theother7 both out in 1 the saine direction. Y shall describe the cutyerQQ. in detail it being lunderstood that the cutter issimilar in all respects.

The kcutter 22 `is provided with a central aperture 22*L for receiving the motor shaft and its midportion 22h from which the hub lis provided with a square Vrecess half the depth of thematerial of the tool at this point; There are two projecting knives 22C and 22d .bothA designed in the same manner so'that a very sharp cutting edge is provided. The two portions of the cutter are fitted together. by being placed at right angles to each other and having theV recess coinciding softhat tliev portion 22hlies up against the portion 23h andv ai. hubr portion is formedv of theN same thickness as if no. recess wereiorined. The.

Vtwo portions of .thei` cutterare located to` gether-obtainingthe same structural eifect as if a single unita-ry structure existed.

lNhen the cutters havebeen .formed to the proper shape andepreliininary to. finishing the ends vor: cutting edges ofthe `tools are hardened,` the inside ors hub` portOIl being left..unhardened to `maintain the reopuisite tensile strength. In this way'toughness is retained andfs'till the edges ofthe knives are suiiciently hardlto retaina keenfcutting edge.

single piece of tool: steelit is impossible orfat leastimpractioable to harden theiends or cut.- tingsedges7 andso breakages are soli'requent that this type of toolis not used forsmall cutters.

The invention besides theftypeshown in the drawings but it is this tool with .which Ihave had sucligood results. rThis tool is of'general rectangular shape with an axial shaft receivingopeningy with theleading'edgecutaway and theoutf cutting edge. It is'not meantnecessarilyto.

` tisular type of tool, but Ythe'invention is lini'itedvonly by the/scope of the appended; daim;

byLetters Batent of the'.UILited= Statesis:

A rotary, grooving, cutter having four blades, whichY permits of lesszrapid? rotationtween `sucf-fessive bladesxforfample chip clear# i ance, said` cutter consisting oiiA two membersl identical exceptas topa right and left orcounterpgartA relation fornrru-tual intertting engagement, comprising-a medial square-re..

my name this 8th day `is applicable to. other` tools Thani claimjas new; and desire` to .protectsv four blades all of which are bounded by the 1 same radial planes, each member having on diagonally opposite or leading sides a semicircular recess extending from a peripheral cutting edge to the line of intersection of the members.

In witness whereof I hereunto subscribe of October, 1928. HENRY JANSEN.

the knives with the usualsh'ape cutting; `edgeV Y This is one .ofethe principalA advantages ob.,` tained by my improvedtool because with a four bladed lknife manufacturedxffrom a:

side end `formed are shape toproducea` sharp .i

restrict the invention to use with thispar-V for same penetration in cutting, than alesser number and yet leaves sufficient space` bee 

